CVE-2009-3621

net/unix/af_unix.c in the Linux kernel 2.6.31.4 and earlier allows local users to cause a denial of service (system hang) by creating an abstract-namespace AF_UNIX listening socket, performing a shutdown operation on this socket, and then performing a series of connect operations to this socket.

Weakness

The product does not properly control the allocation and maintenance of a limited resource.

Affected Software

Name	Vendor	Start Version	End Version
Linux_kernel	Linux	*	2.6.31.4 (including)
MRG for RHEL-5	RedHat	kernel-rt-0:2.6.24.7-137.el5rt	*
Red Hat Enterprise Linux 4	RedHat	kernel-0:2.6.9-89.0.18.EL	*
Red Hat Enterprise Linux 5	RedHat	kernel-0:2.6.18-164.9.1.el5	*
Linux	Ubuntu	hardy	*
Linux	Ubuntu	intrepid	*
Linux	Ubuntu	jaunty	*
Linux	Ubuntu	karmic	*
Linux-source-2.6.15	Ubuntu	dapper	*

Potential Mitigations

Mitigation of resource exhaustion attacks requires that the target system either:
The first of these solutions is an issue in itself though, since it may allow attackers to prevent the use of the system by a particular valid user. If the attacker impersonates the valid user, they may be able to prevent the user from accessing the server in question.
The second solution is simply difficult to effectively institute – and even when properly done, it does not provide a full solution. It simply makes the attack require more resources on the part of the attacker.

NVD	https://nvd.nist.gov/vuln/detail/CVE-2009-3621
CWE	https://cwe.mitre.org/data/definitions/400.html

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

References

CVE-2009-3621

Uncontrolled Resource Consumption

Weakness

Affected Software

Potential Mitigations

Related Attack Patterns

References